Action (pravṛtti) and inaction (nivṛtti), what ought to be done and what ought not to be done, fear and fearlessness, Bondage and liberation (mokṣa), the understanding (buddhi) which knows these, that, O son of Pritha (Pārtha), is of goodness (sāttvikī).
In one who knows activity and rest, acts of right and wrong, bravery and fear, bondage and freedom, understanding is lucid.
(30) The intellect that distinguishes between activity and its cessation, between what should be done and what should not, between danger and security, bondage and release, is [an intellect] in Goodness' way.
18.30 O Pārtha, that intellect is born of sattva which understands action and withdrawal, duty and what is not duty, the sources of fear and fearlessness, and bondage and freedom.
18.30 That Buddhi, O Arjuna, which knows activity and renunciation, what ought to be done and what ought not to be done, fear and fearlessness, bondage and release --- that (Buddhi) is Sāttvika.
18.30 The intellect which knows the path of work and renunciation, what ought to be done and what ought not to be done, fear and fearlessness, bondage and liberation -- that intellect is Sattvic (pure), O Arjuna.